i know someone with a wr426...and i have a some questions, can you help!!! 1 the carb has a red dial with numbers on it to determine the fuel mixture position....is that a factory knob for that bike or is that an after market upgrade? 2. what should be the staring position of the fuel mixture be at to begin with for tuning? ....its a used bike so we don't know it the carb is stock or has been jetted...bike has mods...air box mod and exhaust fmf pipe with power bomb header.....which makes me think the carb might be jetted...the bike has some good torque to it....maybe cause of rear sprocket...not sure.... 3. so if the carb has been jetted what should the starting point of the fuel mixture be set at to start? 4. is turing the screw clockwise make it run lean or rich? 5. currently he as tried to tune it, but he tells me it is overheating so i told him it is too lean...adjust the other direction....in what size increments should he be turning?